return function()
    print("==>Test: lua_os")

    local osTime = os.time()
    print("osTime => ", osTime)

    print("os.date() => ", os.date())

    local t1 = os.date("*t", osTime)
    print(t1) --date object

    -- local t2 = os.date("%y-%m-%d %h:%m:%s", osTime)
    local t2 = os.date("%Y_%m_%d %H:%M:%S", osTime)
    print("t2 => " .. t2)
end
